86f0f0ca114a10f273d857e942144c568d6a720d
VST preset restore has to happen in the GUI thread, specifically the plugin's own UI event-loop (which on Linux and Windows is not usually Ardour's Thread 1). However if there is no plugin GUI, it should be safe to use Ardour's UI thread.
Please see the Ardour web site at https://ardour.org/ for all documentation..
For information on building ardour:
https://ardour.org/development.html
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